YAML Formatter

Format YAML configs with consistent indentation, basic syntax checking, and clear error messages.

For this tool, processing runs locally in your browser and data is not sent to the server.

YAML Formatter is a free online tool that brings YAML configs to a clean, consistently indented form and checks basic syntax. It is useful for Kubernetes manifests, Docker Compose files, GitHub Actions, GitLab CI, and other CI/CD configs. The tool runs in your browser and does not send data to the server.

What it does

Output

Processing

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How to use

Paste a YAML config, Kubernetes manifest, Docker Compose file, GitHub Actions workflow, or other YAML fragment.
Choose an indentation size: 2 or 4 spaces, plus any additional formatting options.
Click Format YAML and check the syntax status.
Copy the formatted YAML, and for complex configs with anchors or Helm templates, double-check in a profile-specific editor before production use.

More about this tool

YAML Formatter brings YAML configs to a clean form with consistent indentation and checks basic syntax. The tool is useful for Kubernetes manifests, Docker Compose files, GitHub Actions, GitLab CI, CI/CD configs, backend settings, and dev files.

You can choose 2 or 4 space indentation, remove trailing spaces, preserve comments where possible, and get a clear error message with the line and column when the syntax is invalid. YAML is sensitive to indentation, so complex files with anchors, aliases, custom tags, and Helm templates should be additionally verified in a dedicated editor.

All processing is done locally in the browser. Your data is not sent to the server.

Runs in the browser
Data is not sent to the server
Formats YAML with indentation
Validates basic syntax
Shows errors with line and column
Useful for Kubernetes, Docker Compose, and CI/CD
Can remove trailing spaces
No registration required

Frequently Asked Questions

What does the YAML Formatter do?

It brings YAML to a more readable form with consistent indentation and checks basic syntax before outputting the result.

Why is YAML sensitive to indentation?

In YAML, indentation defines data nesting. An extra or incorrect space can change the structure of a config or make the file invalid.

Can I choose 2 or 4 space indentation?

Yes. You can select 2 or 4 space indentation in the settings.

Are YAML comments preserved?

Comments can be preserved if the underlying parser/stringifier supports it. If not, the tool should indicate this limitation.

Is the tool suitable for Kubernetes manifests?

Yes, for basic YAML formatting. However, it does not replace Kubernetes schema validation and cannot verify whether a manifest will apply successfully in a cluster.

Is the tool suitable for GitHub Actions and GitLab CI?

Yes, for basic alignment and syntax checking of CI/CD configs. Workflow or pipeline-specific validation should be done with dedicated validators.

Does the formatter fix broken YAML automatically?

No. The tool can show a syntax error but does not automatically guess the structure or modify the config, to avoid corrupting your data.

How is the YAML Formatter different from YAML to JSON?

The formatter works with YAML and returns YAML. The YAML to JSON converter transforms the YAML structure into JSON — a separate task.

Is my data sent to the server?

No. YAML is processed locally in the browser and is not sent to the server.

Do I need to register?

No. The tool works immediately without registration.

How to use

Paste a YAML config, Kubernetes manifest, Docker Compose file, GitHub Actions workflow, or other YAML fragment.

Choose an indentation size: 2 or 4 spaces, plus any additional formatting options.

Click Format YAML and check the syntax status.

Copy the formatted YAML, and for complex configs with anchors or Helm templates, double-check in a profile-specific editor before production use.

More about this tool

All processing is done locally in the browser. Your data is not sent to the server.

Runs in the browser
Data is not sent to the server
Formats YAML with indentation
Validates basic syntax
Shows errors with line and column
Useful for Kubernetes, Docker Compose, and CI/CD
Can remove trailing spaces
No registration required

Frequently Asked Questions

What does the YAML Formatter do?

It brings YAML to a more readable form with consistent indentation and checks basic syntax before outputting the result.

Why is YAML sensitive to indentation?

In YAML, indentation defines data nesting. An extra or incorrect space can change the structure of a config or make the file invalid.

Can I choose 2 or 4 space indentation?

Yes. You can select 2 or 4 space indentation in the settings.

Are YAML comments preserved?

Comments can be preserved if the underlying parser/stringifier supports it. If not, the tool should indicate this limitation.

Is the tool suitable for Kubernetes manifests?

Yes, for basic YAML formatting. However, it does not replace Kubernetes schema validation and cannot verify whether a manifest will apply successfully in a cluster.

Is the tool suitable for GitHub Actions and GitLab CI?

Yes, for basic alignment and syntax checking of CI/CD configs. Workflow or pipeline-specific validation should be done with dedicated validators.

Does the formatter fix broken YAML automatically?

No. The tool can show a syntax error but does not automatically guess the structure or modify the config, to avoid corrupting your data.

How is the YAML Formatter different from YAML to JSON?

The formatter works with YAML and returns YAML. The YAML to JSON converter transforms the YAML structure into JSON — a separate task.

Is my data sent to the server?

No. YAML is processed locally in the browser and is not sent to the server.

Do I need to register?

No. The tool works immediately without registration.